Remember when they wanted you to increase greenhouse gases?

In the 70s, the ecology wackos were predicting that we were doomed by global cooling. But curiously, they weren't encouraging people to increase greenhouse gases as a way to heat up the atmosphere. Don Luskin points us to an interesting question:

Suppose we discovered that the earth was cooling rather than warming due to a natural cycle. Would you encourage people to drive more and use more carbon-based energy as a way of warming the earth?